GHSA-RP69-C9W2-RV4P

Vulnerability from github – Published: 2026-05-06 12:30 – Updated: 2026-06-01 18:31
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE terminator

When batching multiple NFLOG messages (inst->qlen > 1), __nfulnl_send() appends an NLMSG_DONE terminator with sizeof(struct nfgenmsg) payload via nlmsg_put(), but never initializes the nfgenmsg bytes. The nlmsg_put() helper only zeroes alignment padding after the payload, not the payload itself, so four bytes of stale kernel heap data are leaked to userspace in the NLMSG_DONE message body.

Use nfnl_msg_put() to build the NLMSG_DONE terminator, which initializes the nfgenmsg payload via nfnl_fill_hdr(), consistent with how __build_packet_message() already constructs NFULNL_MSG_PACKET headers.

Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-43085"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-06T10:16:21Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE terminator\n\nWhen batching multiple NFLOG messages (inst-\u003eqlen \u003e 1), __nfulnl_send()\nappends an NLMSG_DONE terminator with sizeof(struct nfgenmsg) payload via\nnlmsg_put(), but never initializes the nfgenmsg bytes. The nlmsg_put()\nhelper only zeroes alignment padding after the payload, not the payload\nitself, so four bytes of stale kernel heap data are leaked to userspace\nin the NLMSG_DONE message body.\n\nUse nfnl_msg_put() to build the NLMSG_DONE terminator, which initializes\nthe nfgenmsg payload via nfnl_fill_hdr(), consistent with how\n__build_packet_message() already constructs NFULNL_MSG_PACKET headers.",
  "id": "GHSA-rp69-c9w2-rv4p",
  "modified": "2026-06-01T18:31:29Z",
  "published": "2026-05-06T12:30:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43085"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/15d209bccf9273b4a8b4e579ba0e92d065b6ec8c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1f3083aec8836213da441270cdb1ab612dd82cf4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/296f18e1c3a87c915a92ed27832d5040a22d1072"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/368c22aea490f6f50df831b4f9e3623787686c5b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/57cc509d82b46150a11dcecc8b25eaa177eda34d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9e2182865de781c41ab16b7985e9d26dcefea867"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d1399632ba255d2e02c757af5d9f5d9279ce168c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d552bcfca323d175664d7444989b04f55666978a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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